SiftwrightQubit Flip daily puzzle
Puzzle ·
Solved
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About the puzzle
Qubit Flip is a daily logic puzzle in the Lights Out family, dressed up as a row of qubits. Each tap acts like an X gate on one qubit and its four neighbours. Every daily board is generated from the date, checked for a solution, and given an exact par by solving the board as a system of linear equations over GF(2). So par is the true minimum, never a guess.
A tip for hard days: clear the board one row at a time. Tap the qubit below each lit qubit in the top row, then repeat for the next row. When only the bottom row is lit, the pattern tells you which top-row qubits to tap before sweeping down again.
Curious about the real thing? Our free post-quantum TLS checker shows whether a website is already protected against future quantum computers.
Frequently asked questions
How do I play Qubit Flip?
Tap a qubit to flip it and its four neighbours (up, down, left, right) between |0⟩ and |1⟩. Clear the whole board, so every qubit reads |0⟩, in as few taps as you can. Par is the fewest taps that can possibly solve today's board.
When is there a new puzzle?
Every day at midnight in your time zone. Monday is the gentlest and Sunday the hardest. Everyone playing on the same date gets the same board.
Is it free?
Yes. No account, no ads, no tracking. Your streak and progress stay in your own browser. Practice mode gives you unlimited extra boards.
Is this real quantum computing?
It's a puzzle inspired by it. Flipping a qubit is like applying an X (NOT) gate, and linking neighbours is a playful nod to entanglement. Real qubits can also sit in superpositions, which would make a much stranger game. Under the hood it's the classic Lights Out puzzle, solved exactly with linear algebra over GF(2) to compute par.
Who made it?
Siftwright, a small studio that builds web data APIs for developers and AI agents. We made the game for fun and to go with our post-quantum TLS checker.